X-ray photoelectron spectroscopy of TiO2 and other titanate electrodes and various standard Titanium oxide materials: Surface compositional changes of the TiO2 electrode during photoelectrolysis

Curt N. Sayers, Neal R. Armstrong

Research output: Contribution to journalArticle

211 Scopus citations

Abstract

Surface compositional changes were observed for TiO2 single crystal electrodes used for photoelectrolysis of water. Surface stoichiometries of several types of TiO2, SrTiO3 and BaTiO3 electrodes were characterized by XPS and compared with a variety of titanium, titanium oxide and titanium hydride standard materials. Reduction of the electrode surface in a hydrogen atmosphere results in an oxygen deficient surface composition. Photoelectrolysis at current densities of 10-15 mA cm2 for periods up to 8 h appears to return the electrode surface to a nearly stoichiometric oxygen-to-metal ratio. Reduction of the titanium oxide surfaces was also observed by exposure to an argon ion beam. Analysis of the electrode surface by a combination of XPS and ion-sputter profiling was still possible by simultaneous analysis of standard materials.

Original languageEnglish (US)
Pages (from-to)301-320
Number of pages20
JournalSurface Science
Volume77
Issue number2
DOIs
StatePublished - Oct 2 1978
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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